Voltech AT5600, Руководство пользователя

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C H A P T E R 1 4 - A T E D I T O R
AT5600 User Manual 98-119 issue 14
Page 352
recommended for new test programs. If you are converting an existing test
program from fixed to AUTO surge testing mode, beware that under some
conditions the measured result may change.
Note that the Inductance value may also be entered from a measurement
on the specimen by using the Measure button.
3. Enter the number of impulses.
You may choose only to have one impulse; the test will be quicker to
execute, but there will be less chance of promoting a failure in a
transformer where the inter-turn insulation is damaged and weakened, but
not yet causing a complete short. More impulses give a greater chance of
detecting damaged insulation.
4. Enter the high and low terminal names. Use the mouse to pull down the
menu along side the fill-in box, and double click to select the terminal.
5. Select (mouse click the button) the type of limits you require and enter the
values.
% Enter a nominal value and then the limits as negative and
positive percentage values.
>< Enter minimum and maximum values.
> Enter just a minimum value.
It is very difficult to predict the minimum and maximum areas from theory.
A practical approach is to use the Measure Button (see section 14.5.9):
Measure the area on a known good transformer; let this result be area A
G
.
Wrap an additional single turn around the core, short the two ends
together, and re-measure the area; let this result be area A
F
.
Set the limits as follows:
Max Area A 2
G
=
3
Min Area A + A ) 2
G F
=
(
Remember that these limits are taken from only one transformer, and may
need to be revised after more have been tested.
6. If required, enter the load compensation value as outlined in section 13.5.
7. Select OK. The test specification will then be displayed in the program
window.